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<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>503 - Service Unavailable | scweb</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #333;
            line-height: 1.6;
        }

        .error-container {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 3rem;
            max-width: 800px;
            width: 90%;
            text-align: center;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .error-icon {
            font-size: 4rem;
            color: #f39c12;
            margin-bottom: 1rem;
            display: block;
        }

        .error-code {
            font-size: 6rem;
            font-weight: bold;
            color: #f39c12;
            margin-bottom: 0.5rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
        }

        .error-title {
            font-size: 1.8rem;
            color: #2c3e50;
            margin-bottom: 1rem;
            font-weight: 600;
        }

        .error-description {
            font-size: 1.1rem;
            color: #7f8c8d;
            margin-bottom: 2rem;
            line-height: 1.8;
        }

        .reasons-section {
            background: #f8f9fa;
            border-radius: 15px;
            padding: 2rem;
            margin: 2rem 0;
            text-align: left;
        }

        .reasons-section h3 {
            color: #2c3e50;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
            text-align: center;
        }

        .reason-item {
            background: white;
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 1rem;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            border-left: 4px solid #f39c12;
        }

        .reason-item:last-child {
            margin-bottom: 0;
        }

        .reason-title {
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 0.5rem;
            font-size: 1.1rem;
        }

        .reason-solution {
            color: #27ae60;
            font-weight: 500;
            margin-bottom: 0.5rem;
        }

        .reason-description {
            color: #7f8c8d;
            font-size: 0.95rem;
        }

        .back-button {
            display: inline-block;
            background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
            color: white;
            padding: 1rem 2rem;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            margin: 1rem 0.5rem;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(243, 156, 18, 0.3);
        }

        .back-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(243, 156, 18, 0.4);
        }

        .contact-info {
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 1px solid #ecf0f1;
            color: #7f8c8d;
            font-size: 0.9rem;
        }

        .contact-info a {
            color: #f39c12;
            text-decoration: none;
            font-weight: 600;
        }

        .contact-info a:hover {
            text-decoration: underline;
        }

        @media (max-width: 768px) {
            .error-container {
                padding: 2rem;
                margin: 1rem;
            }
            
            .error-code {
                font-size: 4rem;
            }
            
            .error-title {
                font-size: 1.5rem;
            }
            
            .reasons-section {
                padding: 1.5rem;
            }
            
            .reason-item {
                padding: 1rem;
            }
        }
    </style>
</head>
<body>
    <div class="error-container">
        <span class="error-icon">🔧</span>
        <div class="error-code">503</div>
        <h1 class="error-title">Service Unavailable</h1>
        <p class="error-description">
            服务暂时不可用，服务器正在维护或暂时过载，请稍后重试。
        </p>

        <div class="reasons-section">
            <h3>🔍 可能的原因</h3>
            
            <div class="reason-item">
                <div class="reason-title">1. 服务器维护</div>
                <div class="reason-solution">💡 解决方案：</div>
                <div class="reason-description">服务器可能正在进行计划维护或临时停机，请联系服务器提供商了解情况。</div>
            </div>

            <div class="reason-item">
                <div class="reason-title">2. 服务器资源过载</div>
                <div class="reason-solution">💡 解决方案：</div>
                <div class="reason-description">服务器资源占用过高，通过应用程序池设置，将账户改为NetworkService，优化代码性能。</div>
            </div>
        </div>

        <div style="margin-top: 2rem;">
            <a href="javascript:history.back()" class="back-button">← 返回上一页</a>
            <a href="/" class="back-button">🏠 返回首页</a>
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        <div class="contact-info">
            <p>如果您需要帮助，请联系我们的技术支持团队</p>
            <p>访问我们的文档和教程：<a href="https://schub.icu" target="_blank">schub.icu</a></p>
        </div>
    </div>
</body>
</html>